Obelix

He is a large man who does not see himself as fat, preferring euphemisms such as being "well covered" or having a chest that has "slipped a little bit". Obelix is so in denial over this matter that he usually doesn't even notice when other people refer to him as "that fat one", and often shows total confusion over which fat person people are referring to. When he does understand the allusions are made on his behalf he flies into a rage and starts beating the person who said it up. Sometimes, when he is in a bad mood, just hearing the word "fat" can quickly enrage him. Being called fat, or being hinted as being fat, is one of the main causes of conflicts between Asterix and Obelix which leads to more developing conflicts in which they must work together. Although they usually simply insult each other verbally they inevitably make up swiftly.
from wikipedia